<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区域 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 表格区域 -->
      <el-table :data="rolesList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template v-slot="{ row }">
            <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in row.children" :key="item1.id">
              <!-- 一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(row, item1.id)">{{ item1.authName }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 二级和三级权限 -->
              <el-col :span="19">
                <!-- 二级权限 -->
                <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightById(row, item2.id)">{{ item2.authName }}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <!-- 三级权限 -->
                    <el-tag v-for="item3 in item2.children" :key="item3.id" type="warning" closable @close="removeRightById(row, item3.id)">{{ item3.authName }}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>

        <!-- 索引列 -->
        <el-table-column type="index" label="#"></el-table-column>

        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template v-slot="{ row }">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限对话框 -->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightList" :props="treeProps" show-checkbox default-expand-all node-key="id" :default-checked-keys="defkeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 角色列表数据
      rolesList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 权限列表数据
      rightList: [],
      // 树形控件属性绑定对象
      treeProps: {
        children: 'children',
        label: 'authName'
      },
      // 默认展开的节点key(id)数组
      defkeys: [],
      // 当前即将分配角色的id
      roleId: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    // 获取角色列表方法
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败！')
      }
      this.rolesList = res.data
    },
    // 删除权限
    async removeRightById(role, id) {
      // 弹窗提示
      const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除！')
      }
      // 删除请求
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除该权限失败！')
      }
      // 成功后跟新数据库的权限(因为这里的就是最新的)
      role.children = res.data
    },
    // 分配权限处理函数
    async showSetRightDialog(role) {
      // 保存id到data中方便后续使用
      this.roleId = role.id
      // 显示对应的权限树状图
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) return this.$message.error('获取权限数据失败！')

      this.rightList = res.data
      // console.log(this.rightList)

      // 递归获取所有单据节点
      this.getLeafKefs(role, this.defkeys)

      this.setRightDialogVisible = true
    },
    // 通过递归形式，获取角色下所有三级权限的id，并保存打defkeys数组中
    getLeafKefs(node, arr) {
      // 如果当前node不包含children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      // 三级节点递归获取所有id
      node.children.forEach(item => this.getLeafKefs(item, arr))
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      // 清空data中数组 避免影响其他分配
      this.defkeys = []
    },
    // 点击为角色分配权限
    async allotRights() {
      // 选中和半选中的id数组
      const keys = [...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys()]
      // 拼接id
      const idStr = keys.join(',')
      // 请求分配权限
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })

      if (res.meta.status !== 200) this.$message.error('分配权限失败！')
      this.$message.success('分配权限成功！')
      // 刷新权限列表
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style scoped lang="less">
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>
